Hey Leafo,
Thank you for replying, it's working now and indexed but it's not that perfect.
Let me explain, so the game name is "Miko Adventures Puffball" so if you search for:
"miko" : the game appears
"puffball" : the game appears
"mik" : the game doesn't appear
"adventures" : the game doesn't appear
I don't know why it doesn't appear in all cases, it's a bit unstable to be honest, don't really know...
I've read that the search index in itch is not that polished so I'm not sure if that's the case, hope you know something that might help a bit while searching for the game.